Select the most appropriate option that can substitute the highlighted segment in the given sentence to improve it. If no improvement is required, select ‘No improvement required’.
Effective communication is a skill that can significant enhance your personal and professional life.

Correct option is D

Option (d) which can significantly enhance is the correct substitution.
Explanation: The phrase "can significant enhance" contains a grammatical error because "significant" is an adjective and should be used to modify a noun, not a verb. The correct adverb "significantly" should be used to modify the verb "enhance." Therefore, "which can significantly enhance" is the appropriate correction.
Correct Sentence: Effective communication is a skill that can significantly enhance your personal and professional life.
Grammatical rule used: Adverbs like "significantly" are used to modify verbs, adjectives, or other adverbs, whereas adjectives like "significant" modify nouns.
Example: Proper training can significantly improve your performance.